Duplex reversible rotary liquid-motor.



W. B. PEARSON. DUPLEX REVERSIBLE ROTARY LIQUID MOTOR. APPLIGATION FILED JUNE 7, 1911.

1 ,O4; 2,596, Patented Oct. 29, 1912.

4 SHEETS-SHEET 1.

W. B. PEARSON. DUPLEX. REVERSIBLE ROTARY LIQUID MOTOR. APPLIGATION FILED .nnm'v, 1911.

4 SHEETSSHEET 2.

W. E. PEARSON.

DUPLEX REVERSIBLE ROTARY LIQUID MOTOR. APPLICATION FILED JUNE 7, 1911.

1,042,596. Patented Oct. 29, 1912.

4 SHEETS-SHEET 3.

Fig.3.

kWh-N 555:

W. E. PEARSON. DUPLEX REVERSIBLE ROTARY LIQUID MOTOR.

APPLICATION FILED 11mm, 1911.

Patented Oct-29, 1912.

WILLIAM E. PEARSON, 0F SWAMPSCOTT, MASSACHUSETTS.

DUPLEX REVEEISIBLE ROTARY LIQUID-MOTOR.

Specification of Letters Patent.

Patentedtlct. 29,1912.

Application filed June 7, 1911. Serial No. 631,859.

T 0 all whom it may concern:

Be it known that I, WILLIAM E. PEARSON, of Swampscott, in the county of Essex and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Duplex Reversible Rotary Liquid-Motors, of which the following is a specification.

This invention relates to that class of rotary motors in which a liquid under pressure is caused to impinge upon pistons mounted in a rotary piston-carrier.

One objectof'the invention is to provide a duplex reversible rotary motor of the class above referred to, which shall utilize the motive force applied thereto to the best advantage.

A further object of the inventionis to provide improved means for controlling the operation and movements of the pistons.

With the above objects in view, the invention consists in the duplex reversible rotary liquid motor hereinafter described and claimed, the advantages of which will be obvious to those skilled in the art from the following description.

The invention will be clearly understood from an inspection of the accompanying drawings, in whichFigure 1 is a side elevation of the motor, with one end plate of the casing removed; Fig. 2 is a horizontal section taken on the line 22 in Fig. 1; Fig. 3 is a transverse, vertical section taken on the line 3-3 in Fig. 1; and Fig. 4 is a vertical section taken on the line 44 in Fig. 2.

In order to most eifectively utilize the motive power of the liquid, a duplex motor is provided in which the pistons of one unit or side of the motor are off-set with relation to those of the other unit or.side, so that there is always a piston in full action and there is no possibility of a liquid lock on account of an equilibrium of pressure against the pistons.

To provide a convenient means for controlling the pistons, cams are provided which are bodily movable for adjustment to insure the proper relation between the pistons and the casing during the active or working portion of their travel, but which cams allow the pistons to 'recede from contact with the periphery of the casing during the inactive portion of their travel, and thus reduce wear of the parts and friction. In the present embodiment of the invention a novel means for adjustment is provided by which the cams on the inside or parting wall of the casing are adjusted.

As illustrated in the drawings, the motor comprises two units A and B, which are alike in construction, the pistons'in one being oifset with relation to those in the other, so that one piston is in full action constantly. The casing of the units A and B comprises body portions 10 and 20 of substantially cylindrical form, which contain the piston chambers and are separated by a parting wall 30, the whole being fastened together by bolts 31 and 32. The body portions 10 and 20 are provided with suitable bases by which they may be mounted upon any suitable support. The end walls of the casing are formed by plates 12 and 22, which are secured to the body portions 10 and 20, respectively, by screws or bolts. A driving shaft 33 is journaled to rotate in suitable hearings in the casing. This shaft passes through a suitable stuffing box 34 on the end wall 22.

The body portion 20 is provided with ports 24-, 25, which communicate with passages 26, 27, respectively, extending substantially parallel from the-same side of the vertical plane which passes through the axis of the shaft. sages are formed in tubular projections 28, 29, which extend laterally from the body portion 20. Either passage may be the induction or the eduction passage according to the direction of rotation of the motor. The body portion 10 is provided with ports similar to the ports 24-, 25, which communicate with passages 16, l7, similar to the passages 26, 27 and formed in tubular projections 18, 19, respectively. The projections 18 and 28 are flanged at their outer ends and connected to a correspondingly flanged Y-connection 35, and the projections 19 and 29 are similarly formed and connected to a Y-connection 36.

The piston chamber of the unit A is composed of two eccentrically disposed substantially semi-cylindrical portions 40, 41, the latter being concentric with the axis of the driving shaft 33, and the former having its center located to the left of the axis of the shaft, as viewed in Fig. 1, a distance equal to the active depth of the pistons when infull action.

Mounted upon the shaft 33 is acylindrical piston-carrier 42, provided with a series of The outer ends of said pas llO formed in the parting Wall 30.

Ill

longitudinally extending radial grooves 43, in which pistons 44 are mounted to slide. The movements of these pistons are controlled by two adjustable cams 45 and 4:6. The cam 45 is provided with a laterally proj ecting stud 47, which extends through a slot 48 in the end wall 12 and is provided with a nut tt), by which the cam is secured in adjusted position. The cam 46 is provided with a swiveled eye-bolt- 50, which is inter nally threaded and movable in a slot 52 An adjusting screw 54 engages the eye-bolt 50 and has its head accessible from the exterior of said parting wall. By turning this screw the cam 46 can be adjusted, the swivel connection enabling the cam to properly center itself with respect to the cam rolls on the followers, to be hereinafter described. The inner face of the head of the screw 54: bears against the end of the boss 56 formed on the parting wall, and a cap 58 is threaded upon the boss to cover and protect the head of said screw. The cams 45, 46 are substantially pear-shaped, and comprise enlarged arcuate surfaces which are of such a shape as to control the movements of the pistons so that they will be held in action for the proper length of time and with the desired intimacy of contact with the interior of the piston chamber. The small end of the cams is so shaped that the pistons can re cede from the casing during the inactive portion of their travel to reduce friction and wear.

Located between eachpiston and the cam is a separate, independent follower 60, having its ends provided with trunnions 62, upon which cam rolls 64 are j ournaled to rotate. The followers are made to' slide loosely in the grooves 43, the lit between the pistons and the walls of the grooves and chamber being relied onto prevent leakage. By thus providing separate followers the friction is greatly reduced, and the cost of repairs and replacement due to wear is eatly reduced. The cam rolls 6a, engage tie peripheries of the cams 45 and 4:6, and are forced outwardly thereby, thus carrying the followers which force pistons outward into engagement with the interior of the eccentric portion or active chamber 40 of the casing.

The piston chamber of the unit 18 is composed of two eccentrically disposed substantially semi-cylindrical portions 51 and 53, similar to the port-ions t0 and 41 of the unit A. Mounted upon the shaft 33 is a piston-carrier 55, provided with longitudh nally extending radial grooves 57, in which pistons 59 are mounted to slide. The movements of these pistons are controlled by cams 61 and 63, similar to cams 45 and 4:6. The cam 63 is provided with a laterally project- 65 ing lug 65 which extends into a slot 66 in i ori-anon the parting wall 30. This lug is engaged by the end of an adjusting screw 67, which is threaded in the parting wall and is accessible at the end of a boss68, formed on said wall, said boss being provided with a protect-ingcap 69. By turning the screw so that its inner end moves inward, the cam 63 is moved to bring its enlarged portion in contact withthe cam rolls 70 on the followers 71, which are mounted to slide in the grooves 57, and thus adjust the pistons 59, as explained above with respect to the corresponding parts of unit A.

From the construction above set forth it will be understood that when a liquid under pressure is admitted through the Y-conuection 35 it flows throughthe passages 16 and 26, impinges upon the pistons 44: and 59, and is discharged through the passages 17 and 27 to the Y-connection 86, which may be connected to suitable piping. By reference to Figs. 1 and 4, it will be seen that the pistons 44 are ofiset with respect to the pistons 59, so that when a piston in one unit is pass ing out of full action, a piston in the other unit is coming into full action. Thus a piston is always in full action so that the rotative force of the fluid is utilized to its fullest extent and a liquid lock is prevented.

While I have illustrated and described a preferred embodiment of the invention,I am aware that many modifications can be made by any person skilled in the art without departing from the, scope of the invention as expressed in the claims. Therefore ll do not wish to be limited to all the details of construction shown and described, but

What ll claim is 1. A. reversible duplex rotary liquid motor, comprising a casing composed of two units separated by a parting wall and each having induction and eduction ports, a rotary piston-carrier mounted to rotate within each unit, pistons slidably mounted on said carriers, two sets of adjustable stationary cams for controlling the movements of said pistons, one cam of each set being carried by said parting wall, and means within said wall for adjusting the cams carried thereby, substantially as described.

2. A reversible duplex rotary liquid motor, comprising a casing composed of two units separated by a parting wall, and eachhaving induction and eduction ports, a rotary piston-carrier mounted to rotate within each unit, pistons slidably mounted 11 said car-' riers, the pistons of one unit eing ofiset with respect to the pistons of the other unit, and means for controlling the movements of said pistons comprising a pair of cams adjustably mounted on the outer end walls of said casing, a pair of cams mounted on the parting wall, and means within the parting wall for adjusting the cams mounted there on, substantially as described.

3. A reversible-duplex rotary liquid motor, comprising a casing composed of two units separated-by a parting wall and-each having induction and eduction ports, a rotary piston-carrier mounted to rotatein each unit, pistons slidably mounted on said carriers, two sets of adjustable cams for controlling the movements of said pistons, one cam of each set being mounted on saidparting wall, and screws within said partin wall for adjusting the'cams on said walfi substantially as described.

4. A reversible duplex rotary liquid motor, comprising a casing composed oftwo units separated by a parting wall, a rotary pistoncarrier mounted to rotate in each unit, pistonsslidably mounted on said carriers, a' cam adjustably'mounted on each outer endwall of the casing, a pair of cams mounted onopposite sides 01 said parting Wall, one of said cams being provided with a swiveled eye-bo 1t, and the other having a laterally projecting lug, and screws movable within said parting wall and cooperating with said eye-bolt and lug for adjusting said cams, substantially as described.

5. A reversible duplex rotary liquid motor,

in one of the walls fol-adjusting the camcarried by said wall, a separate, independent 4 follower slidably mounted in each groove and 'adapted to engage the inner o posing face of the corresponding piston, an a pair of cam rolls rotatably mounted on-each fo1 lower and adapted-to cooperate with said cams to control the movements of said'pistons, substantially as described.

' -WILLIAM E. PEARSON.

Witnesses: V

WILLIAM* J. SPERL,

FRANKLIN W. HAYDEN. 

